Portable battery pack



FIG. 1 is an isometric view of a first embodiment of the portable battery pack of the present invention;

FIG. 2 is a front elevational view of the portable battery pack of FIG. 1;

FIG. 3 is a back elevational view of the portable battery pack of FIG. 1;

FIG. 4 is a right side elevational view of the portable battery pack of FIG. 1;

FIG. 5 is a left side elevational view of the portable battery pack of FIG. 1;

FIG. 6 is a top view of the portable battery pack of FIG. 1; and,

FIG. 7 is a bottom view of the portable battery pack of FIG. l.

The broken lines shown in the drawings are included for the purpose of illustrating unclaimed portions of the portable battery pack and form no part of the claimed design. 

The ornamental design for portable battery pack, as shown and described. 